Figure 13. Server components (2.5-inch drive bay chassis)
The parts listed in the following table are identified as one of the following: 
•  T1: Tier 1 customer replaceable unit (CRU). Replacement of Tier 1 CRUs is your responsibility. If Lenovo 
installs a Tier 1 CRU at your request with no service agreement, you will be charged for the installation. 
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ThinkSystem SR665 V3 User Guide